package com.itheima;

public class TestLambda {
    public static void main(String args[]){
        testA();
        testB();
        testC();
        testD();
    }
    public static void testD(){
        D d1 = new D() {
            @Override
            public int max(int a, int b) {
               // return a > b ? a : b;
                return Math.max(a,b);
            }
        };
        D d2 = (a, b) -> a > b ? a : b;
        System.out.println(d2.max(15,25));

        //D d3 = (a, b) -> Math.max(a,b);
        D d3 = Math::max;
        int max = d3.max(10,20);
        System.out.println(max);

    }


    public static void testC(){
        //1.创建C接口的匿名内部类对象
        C c1 = new C() {
            @Override
            public String show(String name) {
             return "name = " + name;
            }
        };
        //2.创建C接口的Lambda表达式对象
        C c2 = name -> "name = " + name;
        String result1 = c2.show("张三");

        //3.创建C接口的方法引用对象
        C c3 = TestLambda::show4;
        String result2 = c3.show("李四");

        System.out.println(result1);
        System.out.println(result2);
    }


    public static  String show4(String name){
        return  "name = " + name;
    }


    public static void testB() {
        //1.创建B接口的匿名内部类对象
        B b1 = new B() {
            @Override
            public void show(String name) {
                System.out.println(name);
            }
        };

        //2.将匿名内部类对象改成Lambda表达式
        B b2 = name -> System.out.println(name);
        b2.show("四李同学");

        //3.创建B接口的方法引用对象
        B b3 = System.out::println;;
        b3.show("三张同学");
    }


    public static void testA(){
        //1.创建接口A的匿名内部类对象
        A a1 = new A() {
            @Override
            public void show(String name, int age){
                System.out.println(name + "," + age);
            }
        };
        //2.将匿名内部类对象改成Lambda表达式
        A a2 = (name,age) -> System.out.println(name + "," + age);
        a2.show("张三",18);

        //3.使用方法引用替换Lambda表达式
        A a3 = TestLambda::show2;
        a3.show("李四",20);

        //4.使用方法引用替换Lambda表达式（成员方法）

        A a4 = TestLambda::show3;
        // A a4 = TestLambda::show3; //方法一
        a4.show("王五",35);

    }
    //定义一个成员方法，故意让返回值和形参和接口A中方法一致
    public static void show2(String name, int age){
        System.out.println("show2:" + name + "," + age);
    }
    public static void show3(String name, int age){
        System.out.println("show3:" + name + "," + age);
    }

}
